as in enigma
something hard to understand or explain why my sister married that guy is still a mystery to my parents

Synonyms & Similar Words

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Synonym Chooser

How does the noun mystery differ from other similar words?

Some common synonyms of mystery are enigma, problem, puzzle, and riddle. While all these words mean "something which baffles or perplexes," mystery applies to what cannot be fully understood by reason or less strictly to whatever resists or defies explanation.

the mystery of the stone monoliths

Where would enigma be a reasonable alternative to mystery?

While the synonyms enigma and mystery are close in meaning, enigma applies to utterance or behavior that is very difficult to interpret.

his suicide remains an enigma

When might problem be a better fit than mystery?

The words problem and mystery can be used in similar contexts, but problem applies to a question or difficulty calling for a solution or causing concern.

problems created by high technology

When is puzzle a more appropriate choice than mystery?

The synonyms puzzle and mystery are sometimes interchangeable, but puzzle applies to an enigma or problem that challenges ingenuity for its solution.

the thief's motives were a puzzle for the police

When is it sensible to use riddle instead of mystery?

Although the words riddle and mystery have much in common, riddle suggests an enigma or problem involving paradox or apparent contradiction.

the riddle of the reclusive pop star

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of mystery SpaceX launched a mystery satellite to geostationary transfer orbit (GTO) from Florida's Space Coast early Sunday morning (July 13). Mike Wall, Space.com, 13 July 2025 Loosely based on the life and novels of forensic anthropologist Kathy Reichs, a producer on the show, each episode of Bones unpacks an FBI case file surrounding the mystery of human remains, as well as the personal lives of its central characters. Natalie Oganesyan, Deadline, 12 July 2025 Despite the year's passage, the mystery endures surrounding the 20-year-old Pennsylvania native’s motivation. Sarah Rumpf-Whitten, FOXNews.com, 11 July 2025 In the shadow of these findings, silent volcanoes in Antarctica and other icy regions, like Russia, New Zealand, and North America, are no longer just geological mysteries. Pranjal Malewar, New Atlas, 11 July 2025 See All Example Sentences for mystery
Recent Examples of Synonyms for mystery
Noun
  • Except there’s a mystery, wrapped in an enigma, and coated in a puzzle.
    Irina Ivanova, Fortune, 13 July 2025
  • Chris Simon, professor emeritus of ecology and evolutionary biology at the University of Connecticut, has been studying cicadas for 51 years and is still trying to understand how these small enigmas do just that.
    Sarah Henry, The Courier-Journal, 8 July 2025
Noun
  • The Mariners reportedly are still in on their former third baseman and would be the final piece to Seattle's puzzle.
    Hunter Mulholland, MSNBC Newsweek, 26 July 2025
  • Need help with today’s Connections: Sports Edition puzzle?
    Mark Cooper, New York Times, 26 July 2025
Noun
  • This research reveals a new mechanism that solves a long-standing riddle – the stability of symbioses involving multiple unrelated partners.
    Guillaume Chomicki, The Conversation, 10 July 2025
  • An exhaustive in-depth investigation by The Post — okay, fine, a few conversations with staffers in Utah’s program — didn’t reveal any concrete answers to this particular riddle.
    Luca Evans, Denver Post, 7 July 2025
Noun
  • This is her secret to being able to pack for a month in Europe in a carry-on.
    Lola Méndez, Travel + Leisure, 23 July 2025
  • Their identities had remained a secret until the hearing today, with the pair simply referred to as D.M. and B.F. in court filings.
    Chris Spargo, People.com, 23 July 2025
Noun
  • More: Silver carp, harmful to fish and water, detected in western Wisconsin's Chippewa and Black rivers The group had done their homework on why these fish are problems.
    Madeline Heim, jsonline.com, 24 July 2025
  • To avoid problems, make sure to compost or age manure properly before use.
    Lauren Landers, Better Homes & Gardens, 23 July 2025

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Cite this Entry

“Mystery.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/mystery. Accessed 29 Jul. 2025.

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